The sixth series of The Great British Bake Off ™ first aired on 5 August 2015, with twelve contestants competing to be the series 6 winner. Mel Giedroyc and Sue Perkins presented the show, and Mary Berry and Paul Hollywood returned as judges. The competition was held in the ground of Welford Park, Berkshire for a second year. The series was won by Nadiya Hussain, with Tamal Ray and Ian Cumming finishing as runners-up.

The sixth series was broadcast as the third season on PBS in the United States where it was called The Great British Baking Show ™.